}
			a, err := ResolveIPAddr("ip", args[1])
			if err != nil {
				t.Errorf("ResolveIPAddr(\"ip\", %q) = %v", args[1], err)
				continue
			}
			_, err = DialIP(args[0], nil, a)
			if tt.shouldFail != (err != nil) {
				t.Errorf("DialIP(%q, %v) = %v; want (err != nil) is %t", args[0], a, err, tt.shouldFail)
			}
			_, err = ListenIP(args[0], a)
			if tt.shouldFail != (err != nil) {

	return 0, syscall.EPLAN9
}

func (c *IPConn) writeMsg(b, oob []byte, addr *IPAddr) (n, oobn int, err error) {
	return 0, 0, syscall.EPLAN9
}

func (sd *sysDialer) dialIP(ctx context.Context, laddr, raddr *IPAddr) (*IPConn, error) {
	return nil, syscall.EPLAN9
}

func (sl *sysListener) listenIP(ctx context.Context, laddr *IPAddr) (*IPConn, error) {
	return nil, syscall.EPLAN9

}

func newIPConn(fd *netFD) *IPConn { return &IPConn{conn{fd}} }

// DialIP acts like [Dial] for IP networks.
//
// The network must be an IP network name; see func Dial for details.
//
// If laddr is nil, a local address is automatically chosen.
// If the IP field of raddr is nil or an unspecified IP address, the
// local system is assumed.
func DialIP(network string, laddr, raddr *IPAddr) (*IPConn, error) {
	if raddr == nil {

	if addr == nil {
		return 0, 0, errMissingAddress
	}
	sa, err := addr.sockaddr(c.fd.family)
	if err != nil {
		return 0, 0, err
	}
	return c.fd.writeMsg(b, oob, sa)
}

func (sd *sysDialer) dialIP(ctx context.Context, laddr, raddr *IPAddr) (*IPConn, error) {
	network, proto, err := parseNetwork(ctx, sd.network, true)
	if err != nil {
		return nil, err
	}
	switch network {
	case "ip", "ip4", "ip6":